Description
Permabond HM128 is a high strength anaerobic threadlocker used for permanent locking of bolts, studs, and cap screws. It cures at room temperature to form a cross-linked plastic bond on steel and common plated fasteners, preventing vibration loosening and reducing the need for mechanical locking devices.
This formulation meets MIL-S-46163A Type I Grade K and ASTM D5363 AN 0221 specifications, making it suitable for regulated and high-reliability assemblies.
Key Product Details
| Property | Value |
|---|---|
| Chemistry | Methacrylate ester |
| Color | Red |
| Viscosity @ 25°C | 500 cP |
| Specific Gravity | 1.1 |
| Gap Fill | 0.15 mm (0.006 in) |
| Max Thread Size | M20 (3/4″) |
| Handling Strength | ~15 minutes |
| Full Cure | 24 hours |
| Break Torque (M10 Steel) | 31 N·m (275 in-lb) |
| Prevail Torque (M10 Steel) | 40 N·m (350 in-lb) |
| Shear Strength | 17 MPa (2500 psi) |
| Temperature Resistance | Down to -55°C (-65°F) |
| UV Fluorescence | Yes |
Performance in Production
- Prevents vibration loosening in threaded assemblies
- Provides controlled off-torque for consistent removal behavior
- Lubricates threads during assembly for accurate torque application
- Cures at room temperature with no heat required
- Faster cure on active metals like copper, slower on stainless steel and plated surfaces
- Cure speed can be increased with Permabond A905 or ASC10 activators
- Maintains strength after exposure to fuels, oils, water, and industrial fluids
Common Applications
- Locking bolts, studs, and cap screws in machinery
- Electric motor assembly
- Industrial equipment manufacturing
- Power transmission components
- General threaded fastener retention in production environments
Available Sizes
- 10 ml Bottle
- 50 ml Bottle
- 250 ml Bottle
- 1 Liter Bottle
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